The author of translation requested proofreading.It means that he/she will be happy to receive corrections, suggestions etc about the translation.If you are proficient in both languages of the language pair, you are welcome to leave your comments.

You could either use "henom", a gender neutral mixture of "honom" and "henne", or use "den" (equivalent to "it", which is quite common to use for animals). The pronoun "hen" is controversial but it's in the Swedish Academy's dictionary.

Furthermore, I would probably change "låt" to "lämna" and use "i fred" instead of "ensam". For example, the English expression "Leave me alone!" is "Lämna mig i fred!" in Swedish (literal translation "Leave me in peace!"). "Ensam" has more depressing connotations, e.g: "He was all alone after his wife died" - "Han var alldeles ensam efter att hans fru dog".

Ohh, of course that helps, you're awesome, haha
Well, it's unknown to me whether the writer thought about this depressing atmosphere or someone was just bothering the fish, but I will change it anyway, tack så mycket!